Well tester



May 5, 1953 l.. E. BROWN ET A1.

WELL TESTER 4 shees-sneet 1 Filed April l5, 1946 w a A.

AVIA May 5, 1953 Filed April 15, 1946 l.. E. BROWN ET AL 2,637,400

wELL TESTER 4 vSheets-Sheefl 2 May 5, 1953 1 E. BROWN ET AL 2,637,400

WELL TESTER Filed April 15, 194e 4 sheets-sheet 5 `uii- 8 32 22 Q q sa Il 5 I 41 I2 l 4. Q l lo 5:' 4 s H E 2% L' b a 2 W WELL TESTER L. E. BROWN ET AL May 5, '1953 lFiled April 15, 1946 Patented May 5, 1953 OFFICE WELL TESTER Luther E. Brown, Greggton, and Ollin W. Williams, Houston, Tex.

Application April 15, 1946, Serial No. 662,142

Claims. (C1. 16S-1) This invention relates to a well tester.

An object of the invention is to provide a tool of the character described whereby a sample may be taken from the side Wall of a well bore and withdrawn to the ground surface for inspection.

It is another object of the invention to provide a well tester of the character described embodying a wall packer which, when expanded, will seal ofi a substantial area of the side walls of the bore all of the way around, said tester containing a sample receiving chamber with a conduit leading inwardly through the wall of the packer and communicating with said chamber to allow the inflow of fluid from said side wall through the packer into the chamber.

It is a further object of the invention to provide a well tester of the character described equipped with means for controlling said conduit whereby the sample will be entrapped in the sample chamber.

It is a further object of the invention to provide in a well tester of the character described, a novel type of packer which has been specially designed4 so that it may be contracted to release the walls of the bore when it may be desired to move the tool longitudinally in the bore.

It is still another object of the invention to provide a tester of the character described wherein provision is made for equalizing the pressure of the well liquid on the inside and outside of the packer while the tool is being lowered or withdrawn with a novel arrangement for relieving the pressure within the packer to the end that the packer will be expanded into contact with the side walls of the well bore by the pressure of the well liquid outside of the packer.

A still further object of the invention resides in the provision of a novel packer assembly which has been specially designed to utilize the pressure of the well liquid outside of the packer to cause expansion of the packer when the pressure of the liquid inside of the packer has been relieved.

With the above and other objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein:

Figure l is a vertical, sectional view of the upper end of the bailer, or sample receiving and `removing equipment.

Figure 2 is a side view of the lower end thereof, partly in section.

Figure 3 is a side elevation of the complete bailer, or sample receiving and removing equipment.

Figures 4 and 5 are side views, partly in section,

of the upper and lower ends of the packer assembly showing the bailer therein and the packer in its collapsed, or unexpanded, position. Figures 6 and 7 are vertical, sectional views of the upper and lower ends, respectively, of the packer assembly in expanded position and with the bailer therein taken on the line 6--6 of Figure 8.

Figure 8 is a cross-sectional view taken on the line 8--8 of Figure 11.

Figure 9 is a fragmentary, vertical, sectional View of the packer assembly with the packer expanded.

Figure 10 is a side elevation, of the testing tool, partly insection, and showing the packer collapsed; and

Figure ll is a side elevation of the tool, partly in section, showing the packer expanded and the tool in position to take a sample.

Referring now more particularly to the drawings, wherein like numerals of reference designate the same parts in each of the ngures, the numeral I designates a conventional tubular drill stem which extends to the ground surface and to the lower end of which a conventional drill 2 may be connected.

Incorporated into the drill stem are upper and lower special couplings 3 and 4 which are connected by intermediate upper and lower drill stem sections 5 and 6, these sections 5 and 6 being threaded together, at their adjacent ends, and whose remote ends are screwed into the respective upper and lower couplings 3 and 4, as more clearly shown in Figures 4 to '7, inclusive.

The lower end of coupling 3 is enlarged and formed with a downwardly ared hood 'I and the upper end ofv coupling 4 is enlarged and formed with an upwardly flared hood 8.

`The special drill stem sections 5 and 6 form, in effect, a packer support and they are surrounded by an expansible sleeve-like packer 9 which is 'formed of rubber or other suitable expansible material.

Within the upper and lower ends of packer 9 are upper and lower1 hollow cylindrical plungers I0 and II whose outer ends are formed into annular, retracted caps I2 and I3, which embrace the upper and lower ends, respectively, of the packer 9 and form heads therefor. These plungers are formed of rigid material and are provided at their upper and lower ends, respectively, with stuffing boxes, I4 and I5 which surround, and

form seals with, corresponding drill stern sections 5 and 6.

The upper end of drill stem section 6 is provided with an external annular rib I6. This rib has upper and lower annular faces IGa and [6b and converges outwardly from said faces, as more clearly shown in Figure 6.

Interposed between the inner ends of plungers lil and Il and the'oppo'sing faces of rib Iiand preferably embedded in material' ofy packer 9 are upper and lower strong coil springs Il and i3 which are placed under compression, when the packer is expanded. These coil springs .reinforce and strengthen the packer and also assist in collapsing the packer when it isf/desired to do so.

Between plungers I9 and. Il and upper and lower drill stem sections 5 and S, respectively, are pressure chambers I9 and 29 which are connected by ducts 2l which extend through the sections 5 andi of the drill stent-fas moreclearly shown in Figures 6, 7 and 8. Ducts 22 lead inwardly trom the -ducts 25,near V.their lower endsthrough-the wall of' the drill'stem section-6 :and into .the-interior thereof.

There are inlet tubes Effi-which open outwardly of Iand extend radially through the packerB and iinto bores' 2liA in-:therib- I6.- The outer ends of these tubes'areformed withannular flanges 24 which are countersunk .intopacker 19- and` said tubes 23 also have intermediate annular flanges zwhichaareem'bedded inthe material of the packer so as to anchor tubes 2-3. in place.A Any ldesired."number of tubes 23 may be provided. four being shown." 'I'Theitubes 23 'are slidable in bores 25 in rib I6, and anchored at the inner ends of said fbores," :inwardly: of z tubes V7.23, -are inwardly opening valve assemblies Z'l-andf'leading inwardly from these bores to the interior of the .drill stem 'areports` 28. -The valve assemblies'- 2! allowl -inilow of outside fluid inwardly through-tubes 23 but close to prevent outflow of -fluid through said tubes.

Above fthe-tubes 231l'ower `drill stem section 6 is 'provided with' ann-inside.4 downwardly tapering seat 29.

'I kBefore lowering .the t'ool as labove described into the well bore chambers |19 and 2'1 and'ducts 2 l and 22 may be lled with oil. or other suitable fluid, oi-they may beleftempty to-become filled with -well liquid as the tool is'lowe'red; Ineither event as the tool 'is Vloweredinto a well filled with liquid to' the desired location for making a test of the side wallst'ratum th'epressure of theiwell liquid 'on the outside ofpaeker 9 and in chambers i9 and 20 will be the same.

Referring now more particularly to Figures .1. 2 and 3, there is shown 'a'baileit or sample receiving and removingr equipment.' wherein numeral 39 designates a hollow cvlndrical housing-'containing a sample receiving chamber' 3|. -The upper end of housing is provided withan outwardly threaded pin 32 for the connection -thereto of a 'cable socket. It is :contemplated that the-bailer `will be lowered down through the 'drill stem'by a cable attached to said socket and leading to the yground surface.

Screwed onto the lower end of housing 39 is -aeylinderl 33 and screwed yinto the lower end of .said cylinder and depending therefrom `isa t11bu lar stemE 34.

The lower end of the stem 34 is screwed-.into the upper end of a vacuum tube 35 whose lower end is closed by plug 3G. This vacuum ltube 35 contains a vacuum chamber 31 'which extends on up into stem 34 and whose upper fper end ofrvacuum tube'35 is a tubular valve 42 whose upper end is of'an external diameter to t closely within drill stem section 5 and be- :neath its upper end said valve 42 is provided with .an .external downwardly tapering seat 43 adapted l to land on seat 29 of the drill stem when said valve 2 4.2 is in its -lowerinost position in the drill stem.

Surrounding stem 34 and interposed between thelower end of cylinder 33 and the upper end of Y "valve 42 is a 'strong coil spring 44. Stem 34 is vnormally latched. in its upper position relative to valve 42 by means of latches 45, 45 which are ivotallymounted invertical side slots 46, 46 cut through theuppen end portion of .valve 42.' The lowerzends of theselatches are inwardlyturned and normally. engage .under an external annular shoulderon. stem 34 andare maintained in said engaging position by. at springs 48, 48 whose lower .ends .are secured to valve 42 and whose upper ends press inwardly against the lower ends of the latches to hold: them engaged, as shown in Figure 1.. .The upper ends of the .latches extend out beyondvalve 4.2. .,Stem. 34 has upper, radial inlet ports 49 above .partitiont .and lowenoradial outlet ports50 .beneath said partition and above .and 'beneath these respective ports aresealrings, .5 I .52, which are countersunk intostem 34an`d.forms seals between itandlx'alve .42. .T ubular` valve 42 has upper vand.lowerinletports 53,54 andabove these ports. 53 .and 54. .are external annularseal rings 55 while beneath said respective portsare annular seal ringsf59., all .countersunk into. valve 42`as illustrated in Figure 2.

With the. bailerassembled as shown in Figures 1, 2 `:and 3, itmaybe let down into the d-rillstem .until .seat 43 Iandsonseat .29. Just before said seat 43 so lands. theouter ends of latches 45 will strikeithe upper end vof .drill .stem section 6 .and thelower inwardlyturned ends of saidlatches'will bedisengagedfrom shoulder 41 and stem 34 may thereupon move downwardly relative to sleeve valve 42. When. .seat 43 .lands on seat 29 .inlet ports 54 of the. valvewillregister with ducts 22 andupon .further downward movement of .stem 34 relative to valve 42l0wer ports 59 of .said .stem .will register with ports. 54 of..the..valve and .ducts 22 of the drill stem.

Fluid, .under lpressure, in .pressure chambers I9 and- 20 Yanclducts 2i .will thereupon be relieved into lvacuum chamber .31. .This will .decrease the pressurewithin packer 9 Vso that .the pressure withintbe packer will bernuchless than the .pressure on the outside of the packer and,..there being low pressure in chambers I9 and Z3, the Vpressure of well liquid outside of the packer will force plungers llland |.l toward each other, further compressing spr'ngs Hand I8 and causing aneXpansion of packer .9 into contact with .the walls of. the bore as shown more` clearly in Figures 6, 7 and 11.

Atthe same Atimeinlet ports 53 of valve 42 rwill rerister with ports 28 through the drill stem and inlet ports 49 of stem 34 will register with ports 53 of sleeve valve to allow an inflow of iluid from the surrounding stratum of thebore through tubes. 23, past valve .assemblies 2'l.and

ntoxthe interorfof stenripf3lif-v This.fluidiwill.paure upwardly through tube.y 4.0 and out.- througla-.portsi 5. 4 l@ and ithe :pressurey o'ithe: inflowing fludfwill, lift.

plunger 39f.-.

tweenastems, and .sleeveivalvev .42- and-seal rings.

Eiland/5e iormwuidttight. sealsbetweeri said tubes. Wil-libe `drilling :fluid l or fluidi; contaminated withfdrillingtfnuid fandpthereore, A1previsiondias.: been madefor retarding iniiow ofsuela-afluid'.until-l thei. packer has. beenrfully 'seateclagainsta the; walls: f of fthe4 bore so as:l to 4reduce as; muchras 'possible'- entrance of` contaminated fluid... from rsurroundef ing; stratum into. :the sani-ple receiving f cham-ber..-

Thefbailer.- isnallo'wedtoi remain'inv said positionV forf-a time 'untili a sample otheucontents ofzxthes surrounding ystratum? hasvhaditime. to; flow;` into. Thereupon the f bailerxis.' withdrawn; from fthe Well. Up'onf initial.

and -iill sample" chamber -'3 Lf upward movement oithe' bailer stem: 34v will first) move upwardly tlmsrcarrying` ports .llrandizvoutf of. registrationswith:4 ports: 53:.' and x Eil!y fand'; will bei.:

4e5A latches "'45 `witlri shoulder-w41: andwthe :closing of'y latcheclfn itslupper .position'bv yengagement of ports; 495:: 5w will entrap: thisz sample. in; chamber 3 l. Plungerf Sfwll 1 alsoifmove "downwardly intoH its 'flowers :'positiom the.l plunger; has. 'ana annular sealzring :5B therearound; 'andi countersunk there-ff ing-which forms a seal with wal-ls;` of':cylinder 33',

and; this; "also, assists in. trapping the. ilnidly Upon initial.. upward movementlof the: mailerY the .upper end of' vacuumxtube 35 will engage-the lowerfend 'of sleeve valve .42'v 'and` saidsleeve .valvey willi: be- :pufllecloutry of:r 'the rpackercand "the 'baile'r may. :then: be removed to` the :ground surface;ftovA be: brokenup Aand the sample-'inspected'.

' Thesupper end ofsamplel chamber 3l hasl an' outlet port 59 which is normally closed'lby `aserew* screwed-:through the wall 'ofhousing 1 33? and whose .inner Vend 'terminates in:- aneedle4 valvef'A 62'1 f whiohfwhen'sorewed: iritofitsfinner" position? will' cln'se. port" The head "ofscrewf'ly is'icounter-f sunkv into Vthe:housingr and th'e'fscrewf is surround-J eel` by an' suitable ipackingf BEF 'to prevent leakage:- If ti'bedesired to test1'theipressurewithinithe samplerch'amber plugi'fmaybe removed.' while valve rc62' :is :closedand 'a pressure-gauge#substiandl'thegauge will register thepressure'.

Upon: withdrawal of 'the bail'er uid'- irl-theA chambersf'lfiland 2'will thenbefexposed '-torthe' pressure :of` vthe well' liquidJ which 'lmay'jentersaid clrarnbersftliroufrh` ducts-22 'and`- 2l land-'springs-rr I1; :fand ll8l=willt1fienl orcaplungers'A Ml Aand? l'l1 'irropposite'directio'ns apart from thee-packer thusl causingrthe'packer Ato collapsevsorthat theftool" maybe relo'catedv in th'fe well'f bore yfor an addi'e tional: testvor mayfbe withdrawn.;

Whatwe claiinfis':

l.: Inv arwall? tool-'a-'paeker aesembly'cnrnnrifse inet. a1tubula`r paola-ei" support' onento l afwell bore at'lits; lQWerJend; anI expansible sleeve-likepackersul- 6?; arounct .anassupperted(barthe-'supporujubular j 'eid.materiamorminaith endsflqo vlthe;.pac1:eV ,f y,and-f slidablearonsthasunpe i and formingz'fuid vtig-hisv joints.therewith .fa presi-.z f

sure-chamber between rearth :plunger and thefsupf port, saidlassembly;-having,e4 -portfconnecting the. chamber-sainte.: the interior. pi; the support.-wliere---Y by: Kthe; :uid pressure within: the chambers: gana onxthe. 'outside 4of,;the1 packen :will: be.4 equalize@4 whew-the tool:I is.I submerged iniv lquidfina, ywel/1.3.- boree andi means for: loweringffthe `pressure inl-said.:y chambers'to. allow. themovement ofy the: plunaersfr towardi `each other@ by fthe pressures ofi alleV wellv fluielqoutsideiof: thepackerzrto: cause.: expansienrof;il

Z'ffIn' sa "well: tool, arpacker-'iassemblyacomprisa. ingwra. tubular. `packer support;f an: expansi'bleuslteevedike;I packer aroundv 'the vsuppora'rtubulam pllungers-f ff'ormedl of. rigid' material' `formingr @their endsfofthe Ypacker `and sl'idable Orr.the,support:- and'- forming` fluid tight joints therewith',y a; -sep-1 arate pressure chamber between each plunger; and?4 the support," an opening infsaidasupport. below-i-said..l packercommunicating. the exterior .ofi' tha-packer with'.k the interior thereof;4 said as. .y sembl'vhaving a: passageway -connecting ythe chambers and openingsfinto the. interior-'0f "the support: :whereby ytlie -fluid1 pressures.. withinfthe'- chambers and' on`V the outside of' lthev tool aboutlf the-i` packer will, bei, equaliz'ed :when the. toolA iis: submerged in the-liquid -inf a well; \a -hollowvrstem inA the support; said-stemrbeing` closed' l atr its lower# endendy havingarrinl'etopeningexteriorlyof` the'. steun,- and said stem. beingA independent-ly zmow =ab1"e=-in ther support`l to. a position tof` establish.-

communication between` saidv passageway 'I and said'. inletw to Adirect fluid from said chambers-into said I "stem: to Vreduce y-luid pressure.y "within-said chamber to permit; the movement of' the plungers.-V toward ieach other* underthe influence ofI 'the v` pressure ofthe swell. fluid `outside of the packer tof-expand the. packer.

3. 11n a welltoolja packer assemblycomprising; Y a tubular A'packer support- 'ornen-y atv its lowenend-11 tofa well` bore,` a sleeve-like -expansibl'e' packer around' the support' and' supported#tlierebxyn;A plungers` within Athe ends of vthe packer aroundtiiemsupport in sea-ling relation therewith andr Whose'oute'r" ends form'- end-heads forti-ie packen a pressure chamber in the assemblyj between-theplungers;r said# assembly -fhaving "a ductrleading. fr'orrrthefchambereand openingginteriorlyY of thesuppofrt tcl-direct the yliquidA in` which the. asserrl-y bly-is submergedinv a -vvellg intc'vsaijdv chamberfftof equali'zevth'ef pressurev in; the chambergand on the outside `of thepaelrera removable hollow stemf inl saidsupportsI said' stem- ;having a uid receiverA therein-"and an inlet- -i'n communication; withY saidy receiverand opening-exteriorlygof the stemg. saidj stem' beingjm-ovable inthe support to a position'V to establish' communicatipn'through; said "duct/ betweensairi chamber and said receiver to lower. the--1'. ressure-in'` said" chambery and to cause. the. pressure orsaid well fluid outside said packer'to; move-#the plungers. toward each other; tcrexpand,` the packer.:

li;y In-1a1well tool', a packer assembly eomprsirig:l` a tubular'packer support, a sleeve-like expansible packer around the support 'and supported therepressure-chamber in the assembly between said supporting elements, said assembly having a duct leading from said chamber and opening into the interior of the support to admit the liquld 1n which the assembly is initially submerged 1n a Well bore into said chamber to equalize the pressure in the chamber and on the outside of the packer, a .hollow stem closed at its lower end insertable in said support and having a fluid receiver therein and an inlet in communication with the receiver and opening exteriorly of the stem, packing means on the stem above and below said inlet engageable with the support to form a seal between the exterior of the stem and the interior of the support above and below said inlet, said stem being movable in the support to a position to establish communication through said duct between said chamber and said receiver to lower the pressure in said chamber to permit expansion of the packer by the endwise compressive force of the pressure of the liquid in the well bore outside of the packer, exerted against the ends of the packer.

5. In a well tester, a packer assembly comprising, a tubular packer support open at-its lower end to a well bore, a sleeve-like expansible packer around the support, supporting elements within the ends of the packer around, and slidable on the support in sealing engagement therewith, a pressure chamber in the assembly between said elements, said assembly having a duct leading from said chamber and in communication with the interior of the support to admit the liquid in which theassembly is submerged in a well into said -chamber to equalize the pressure of the liquid in the chamber and the pressure on the outside of the packer, means for reducing the pressure in said chamber to effect expansion of the packer by endwise compressive force of the liquid outside of the packer, against the packer, sample container means lowerable-into the support, said packer having fluid inlet means mediate its ends opening exteriorly of the packer and in communication with the interior of the support, a conduit in said sample container means communicating with said iiuid inlet and sample container meansand a sleeve valve in the support between said inlet and said conduit and movable relative to said container means for controlling communication between said uid inlet and the sample container means. l

6. In a well tester, a packer assembly comprising, a tubular packer support adapted to be lowered into a well bore, an expansible packer around the support, means communicating the interior of said. support with a well bore and the exteriorofthe packer with the interior thereof, supporting elements within the ends of the packer around, and slidable on the support in sealing engagement therewith, an internal pressure chamber in the assembly between the elements, said assembly having an internal duct which leads from said chamber and which is in communication with the interior of the support to admit the liquid in which the assembly is submergedv in the well into said chamber to equalize the pressure of the liquid in the chamber and the pressure of the liquid in the well bore on the outside of the packer, said packer having a test fluid inlet mediate its ends opening exteriorly of the packer and in communication with the interior of the support, a removable hollow stemclosed at its lower end and disposed in the support, said stem having sample -container means therein and a passageway opening exteriorly of the stem and in communication with said sample container means,l a fluid receiver in the lower end of said stem separate from said sample container means, said stem also having an opening communicating with said receiver and with the exterior of the stem, and a sleeve valve slidable on the stem and seated in said support, said valve having spaced ports therethrough, one of which is communicable with the test fluid inlet and the other of which is communicable with the internal duct said stem being movable relative to the seated valve to establish communication through one of said ports between said chamber and said receiver to lower the pressure in said chamber to eect expansion of the packer by endwise compressive force of the liquid in the well bore outside of the packer against the packer and to establish communication through the other of said ports between said test uid inlet and said sample container means.

7. In a well tool, a packer assembly comprising, an open ended tubular packer support adapted to be lowered into a well bore, a sleeve-like expansible packer around the support, tubular rigid supporting elements within the ends of the packer and slidable on the support in sealing engagement therewith, a pressure chamber in the assembly between the elements, said assembly having a duct leading from said chamber and opening into the interior of the support to admit the liquid in which the assembly is submerged in the well bore into the chamber to equalize the pressure of the liquid in the chamber and the pressure of the liquid in the well bore on the outside of the packer, a hollow stem insertable in the support and having an inlet opening exteriorly of the stem and in communication with the interior thereof, means initially closing said inlet opening, means in said support for opening said inlet opening, said stem being closed below said inlet opening and movable in the support to open said inlet opening and establish communication between said duct and said inlet to lower the pressure in said chambers and cause the movement of said elements toward each other by the endwise compressive force of the pressure of the liquid in the Well bore outside of the packer exerted against said elements to expand the packer, and yieldable means in the assembly cooperable with said support and said elements to urge said elements apart.

8. A well tester for obtaining samples of the fluid content earth formations traversed by a bore hole, comprising an'open ended tubular support adapted to be lowered into the bore hole, an expansible packer mounted on the support and having end members slidably mounted on said support in sealing relation thereto, said support and packer forming an assembly including an internal pressure chamber within the packer between the end members and said assembly having a duct therein in communication with said chamber and with the interior of the support to admit liquid from the wellv bore in which the assembly is submerged to equalize the pressure in the chamber and on the outside of the packer, said packer having a test uid inlet opening exteriorly of the packer and in communication with the interior of the support, a hollow stem insertable in the support, said stem having a sample container therein and a passageway communicating with the sample container and opening exteriorly of the stem, a fluid receiver in said stem separate .from said sample container means, said stem having an opening in communication with said recelver and opening exteriorly of the stem, a sleeve 9 valve around and slidable on the stem and seatable on a valve seat formed in the support, said valve having spaced ports disposed in registration with said duct and said fluid inlet when seated on said valve seat and said stem being movable in the valve to a position to establish communication through one of said ports between said duct and said duid receiver to reduce the pressure in said chamber to cause expansion of the packer by endwise pressure of the liquid in the well bore outside the packer and to establish communication through the other of said ports between said fluid inlet and said sample container to admit a iiuid sample to the container from a surrounding formation.

9. In a well tester, a packer assembly comprising, a packer support adapted to be lowered into the well an eimansible packer around the support and supported therecn, supporting elements within the ends of the packer around, and slidable on the support in sealing engagement therewith, said assembly containing an internal pressure chamber and also having an external duct which leads from said chamber into the interior of said support and which is initially in communication with the liquid in which the assembly is submerged in the well to equalize the pressure of the liquid in the chamber and the pressure of the liquid on the outside of the packer, test iiuid inlet means in the wall of the packer, a stem having sample container means positioned in the support, a low pressure chamber insertable in said support for permitting exit of fluid from said pressure chamber, a conduit in said stem communicable with said iiuid inlet means and sample container means, and valve means on the stem controlling communication of said low pressure chamber with said internal duct to permit eX- pansion of the packer by the endwise compressive force of the liquid outside of the packer against the packer, said valve means being also adapted to control communication between said luid inlet means and sample container means.

10. A well tester for obtaining samples of the uid content of earth formations traversed by a bore hole comprising an open ended tubular support adapted to be lowered into a bore hole, a sleeve-like expansible packer formed of flexible material mounted on the support and whose ends are slidable relative to the support and in sealing engagement therewith, said packer containing a pressure chamber between said ends and said assembly having a duct in communication with said chamber and terminating in a port in communication with the liquid in which the packer is submerged in the well bore to equalize the pressure of iiow within the chamber and the chamber of fluid on the exterior of the packer, a stem lowerable in the support and containing a lower pressure chamber having an inlet communicating with said low pressure chamber and adapted to be brought into registration with said port, said inlet having means for closing the same openable to relieve the pressure from the chamber within the packer to permit the expansion of the packer by the endwise pressure of the liquid in the well bore outside of the packer on the l packer, said packer having a test uid inlet mediate its ends opening exteriorly of the packer and in communication with the interior of a uid receiving chamber in the stem for containing the sample obtained, valve means carried by said stem controlling the flow of a sample into said uid receiving chamber.

LUTHER E. BROWN. OLLIN W. WILLIAMS.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 2,098,484 Brundred et al Nov. 9, 1937 2,138,375 Grant Nov. 29, 1938 2,177,203 Bradley Oct. 24, 1939 2,196,668 Ragan Apr. 9, 1940 2,227,731 Lynes Jan. 7, 1941 2,390,372 Johnston et al Dec. 4, 1945 2,404,825 Brown et al July 30, 1946 2,516,581 Lynes July 25, 1950 

